Lorenz Schümann

Oops, my bad. I forgot that I had a texture set in the shader. There you get problems with pre-multiplication. Plugged in like shown in the picture all is working fine now. (I could also plug in the PNG directly, as the alpha is ignored.)
Thank you for your answer. Made me confront myself with the topic of pre-multiplication.

Hey there,
I use the alpha channel of a PNG to layer materials. However, you can see an edge in the fall off to transparency. In an image editor it's fine; there is a clean transition to the background. The arrow in the picture points on how it should look like. I know, when I make a second version with a white background, then on white you don't see an edge. But I hope there is a more flexible solution.

Hi, I'm having the same problem, that is, that Mantra nodes get created on their own. Can't say when, but over 250 so far.
Any solution?
Edit: Just went from Render View to Scene View and 28 Mantra nodes where created. And that is repeatable. A new scene, same behavior with 2 Mantra nodes created.
Forgot to tell: I'm on Houdini 16.5.536.
Edit1: Now it's the same as with the thread starter; plenty of Mantra nodes get created when I go from Geo to Obj level.